Change various helper classes to transition types to get CSSValue entirely onto the gc heap.

Source/core/css/resolver/MediaQueryResult.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 11 matching lines @@
 
 #ifndef MediaQueryResult_h
 #define MediaQueryResult_h
 
 #include "core/css/MediaQueryExp.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/RefCounted.h"
 
 namespace WebCore {
 
-class MediaQueryResult : public RefCounted<MediaQueryResult> {
-    WTF_MAKE_NONCOPYABLE(MediaQueryResult); WTF_MAKE_FAST_ALLOCATED;
+class MediaQueryResult : public RefCountedWillBeGarbageCollectedFinalized<MediaQueryResult> {
+    WTF_MAKE_NONCOPYABLE(MediaQueryResult); WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
 public:
     MediaQueryResult(const MediaQueryExp& expr, bool result)
         : m_expression(expr)
         , m_result(result)
     {
     }
 
+    void trace(Visitor* visitor) { visitor->trace(m_expression); }
+
     MediaQueryExp m_expression;
     bool m_result;
 };
 
 }
 
 #endif